...the difference in birth weights between the two time periods is roughly the difference in birth weights between a baby born to a mother with a disadvan

...the difference in birth weights between the two time periods is roughly the difference in birth weights between a baby born to a mother with a disadvantaged background who received supplemental nutrition during pregnancy and a baby born to a similar mother who didn't get that help. I think a map correlating power plant pollution plume estimates with the reporting hospitals or physicians that provided infant data, and their areas served would be helpful in representing the relationship between these two events. Here seems to be an older version of the source, with power plant maps: http://conference.iza.org/conference_files/environ_2015/severnini_e8895.pdf http://conference.iza.org/conference_files/environ_2015/seve... Paywalled version: http://www.nature.com/articles/nenergy201751 http://www.nature.com/articles/nenergy201751 Infant vital statistics are drawn from county-level sources.